Ron Livingston and Rosemarie DeWitt Welcome Daughter Gracie James!

Baby makes three for Ron Livingston and RosemarieDeWitt! The couple welcomed their first child, daughter Gracie James, on Monday, Apr. 29. "The whole family is happy and well," reps for the stars tells Us Weekly.

It's going to be a busy summer for Livingston, who appears in the supernatural horror film The Conjuring with Vera Farmiga and PatrickWilson (in theaters July 19). The actor -- perhaps best known for playing disgruntled employee Peter Gibbons in 1999's Office Space -- will also appear in the new season of HBO's Boardwalk Empire this fall.